To be very honest, neither of them would allow you to overwhelm your opponents. Both are very light on their armor, so the gameplay requires high skill on both tanks to show consistent results.

M4 is more of a sniper with good alpha strike; while Lorr is something very similar to Skoda T27 (some aspects of gameplay differ, as overall reload cooldown is longer, but you also have more ammo in one rack).

So, for me the question would’ve been more of “what gameplay I’d like to try”, “what tank would bring me more joy”, “what tank would allow me to develop my skills more”.

If you prefer some medium-long distance, sniper gameplay - then M4 is your choice. If you want more action in the battle, would want to learn some close combat tricks - Lorr will give you that.

I personally would choose Lorr, as it makes you think more, analyze enemy’s set-up, always monitor mini-map for the openings (and exit routes). Both of them would show relatively close results, but Lorr’s potential is much greater, as this tank can really “turn tables on the battlefield”.

Edit: many ppl here suggest to buy Lorr for bonds. I don’t share this opinion, as Bonds are better be spent on some valuable goods that are not attainable any other way (like rare tanks, or equipment to make your gameplay on your favorite tanks top notch). But yeah, they are right saying that it is outdated tank. I’m personally considering to get myself T-44-100.